Variable Camshaft Timing Kit - Fits 2004, 2005, 2006, 2007, 2008 5.4L 24 Valve Triton Ford Expedition, F-150, F-250, F-350 Super Duty, Lincoln Mark LT, Navigator - Chain, Guide, Tensioner & Cam PhaserCategory: Tomei Valve GuideYour engine depends on proper timing between the crankshaft and camshafts to run properly. Overtime, the factory timing components including the VVT Cam Phasers, timing chains, timing chain guides, or timing chain tensioners can fail. These failures often lead to excessive noise from the engine, a check engine light (CEL), decreased fuel economy, and decreased power. In some situations a failure of a timing part can lead to complete engine failure.The 24 Valve, 3 valve per cylinder V8 5.4L Triton motors for Ford trucks are prone to some of these failures as the mileage on the vehicle increases. The 5.L Triton engine commonly produce distinctive rattling noises due to wear on of the timing components. While most noise are normal, excessive ones calls for an inspection. The camshaft phasers, tensioners and the guides may fail over time and replacing them is required to maintain your truck. This complete kit manufactured by AA Ignition includes all the replacement parts needed to perform a complete timing service on your 24 Valve, 3 valve per cylinder V8 5.4L Triton engine.Please note that due to the critical and complex nature of engine timing professional installation is highly recommended.Fits the following 5.4L 3 valve engines with 8th Vin Digit "5" : 2005-2008 Ford Expedition 2004-2008 Ford F-150 or 8th Vin Digit "V" 2005-2008 Ford F-250 Super Duty 2005-2008 Ford F-350 Super Duty 2006-2007 Lincoln Mark LT 2005-2008 Lincoln Navigator Replaces the following part numbers for each part: Camshaft Phaser Sprockets - 3R2Z 6A257-DA Phaser Bolts - 3L3Z 6279-DA Primary Chain Tensioner - XL1Z 6L266-AA Primary Chain Tensioner - 1L3Z 6L266-AA Timing Chain Guide - F85Z 6K255-AA Timing Chain Guide - 4L3Z 6M256-AA Timing Chain Guide - F85Z 6M274-AA Timing Chain Guide - 2L1Z 6K297-AA Lower One Piece Double Crankshaft Gear - XL3Z 6306-AA Front Crankshaft Seal - XW4Z 6700-AA Front Timing Cover Gasket - 3L3Z 6020-EA Front Timing Cover Gasket - 3L3Z 6020-FA Front Timing Cover Gasket - 3L3Z 6020-DA Timing Chains - 5L3Z 6268-A This is a compatible replacement part manufactured by AA Ignition. This variable camshaft timing kit is NOT a genuine Ford or Lincoln part. Ford, Lincoln and their associated vehicle models are registered trademarks of their respective owners. These trademarks and part numbers are used in this listing only to identify the vehicles this variable camshaft timing kit fits. AA Ignition is a registered trade mark of GWA Auto Parts Inc.